Exact decimal money math. No floating-point cents — ever.
0.1 + 0.2 = 0.30000000000000004. Splitting $100 three ways loses a cent. Tax extraction drifts. This API runs every calculation on BigInt fixed-point integers, so results are exact to the minor unit and parts always sum back to the total.
add · subtract · multiply with 7 explicit rounding modes (incl. banker's rounding).
Split a total by weights with largest-remainder — no lost or phantom cents.
Even N-way split; remainder distributed deterministically.
Add tax to net, or extract net+tax from a gross-inclusive amount.